Sol–gel preparation and luminescent properties of CeO2:Ln (Ln = Eu3+ and Sm3+) thin films
Sol–gel preparation and luminescent properties of CeO2:Ln (Ln = Eu3+ and Sm3+) thin films
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DOI：
10.1016/j.jeurceramsoc.2005.03.165
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发表时间：
2005
影响因子：
5.7
通讯作者：
M. Oikawa;S. Fujihara
中科院分区：
文献类型：
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作者：
M. Oikawa;S. Fujihara
采用溶胶-凝胶法制备了新型透明CeO2:Ln（Ln=Eu3+或Sm3+）薄膜荧光粉。 Ln 浓度为 1at.% 的 CeO2:Ln 薄膜在紫外 (UV) 光激发下表现出最强的光致发光 (PL)。在较高的 Ln 浓度下，由于非辐射能量转移，PL 强度降低。对于以反演对称性掺杂在 CeO2 晶格中的 Eu3+ 离子，当在 340nm 波长激发时，由于磁偶极子 5D0→7F1 跃迁（591nm）而产生的橙红色发射占主导地位。相比之下，Sm3+离子由于4G5/2→6H5/2而观察到更强的橙色发射（573nm）。显然，Eu3+和Sm3+离子通过UV照射引起的“Ce4+–O2−”电荷转移态的能量转移具有不同的激发效率。
New transparent CeO2:Ln (Ln=Eu3+or Sm3+) thin-film phosphors have been fabricated by a sol–gel method. The CeO2:Ln films with the Ln concentrations of 1at.% showed the strongest photoluminescence (PL) upon ultraviolet (UV) light excitation. At higher Ln concentrations, the PL intensity decreased because of the nonradiative energy transfer. For Eu3+ions doped in the CeO2lattice with inversion symmetry, an orangey red emission due to a magnetic-dipole5D0→7F1transition (591nm) was dominant when excited at a wavelength of 340nm. In contrast, much stronger orange emissions (573nm) due to4G5/2→6H5/2were observed for Sm3+ions. Apparently, the Eu3+and the Sm3+ions had different efficiencies of the excitation through the energy transfer from the “Ce4+–O2−”charge transfer state induced by the UV irradiation.